Mixing or No Mixing (Descending Interface) or Extended Discharge

Mixing means that as agent leaks out the incoming air is continually mixed with the remaining agent in the room so that the concentration is constant throughout. Mixing gives equal protection to all levels in the enclosure. Sometimes the air-handlers must remain running during the retention time to keep equipment cool. Other times mixing must be used because protection is required at high levels. Often mixing is unintentionally created by convection currents caused by hot equipment of equipment cooling fans that must remain on during the retention period.

The initial concentration must be made greater to allow for the drop in concentration.

This icon is used throughout the program and on reports to show that mixing will take place.

To determine if there is mixing, a smoke test must be performed where small puffs of smoke are placed near the protected equipment. If the smoke puffs immediately dissipate, there is continual mixing. If in doubt, it is possible to pass both the mixing and the no mixing cases.

No Mixing or Descending Interface means that as agent leaks out the incoming air is NOT mixed with the remaining agent in the room so that a layer of air forms on top of the agent. NO Mixing gives protection only below the air-agent interface.

The greater the initial concentration, the faster the agent will be lost.

This icon is used throughout the program and on reports to show that NO mixing will take place.

2000 Fire Door-Fan Manual

updated 2002-05-28

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Canon 2000 manual Fire Door-Fan Manual
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2000 specifications

The Canon EOS 2000D, also known as the Rebel T7 in some regions, is an entry-level DSLR that caters to beginners and amateur photographers looking to explore the world of digital photography. Launched as a successor to the EOS 1300D, the 2000D brings a host of features and technologies that make it an appealing choice for those stepping up from smartphone photography.

One of the standout characteristics of the Canon 2000D is its 24.1-megapixel APS-C CMOS sensor. This high-resolution sensor enables users to capture stunningly detailed images with vibrant colors and rich tonal range. Coupled with the DIGIC 4+ image processor, the camera delivers improved performance in terms of image quality, low-light capability, and overall processing speed.

The Canon 2000D features a 9-point autofocus system that includes one cross-type point, helping users achieve accurate focus on subjects. While this autofocus system may not be the most advanced in the market, it is sufficient for general photography tasks, including portraits, landscapes, and even some action shots.

The camera boasts a 3-inch LCD screen, which provides a clear interface for composing shots and navigating settings. Although it lacks a touchscreen, it offers straightforward usability that appeals to novice photographers learning the ropes of DSLR operation. The optical viewfinder with approximately 95% coverage allows users to view scenes through the lens for precise framing.

For those interested in videography, the 2000D offers Full HD 1080p video recording at 30 frames per second. While it may not excel in advanced video features, it provides a solid entry point for hobbyists looking to experiment with video content. The presence of built-in Wi-Fi and NFC capabilities allows for easy sharing of images and remote control of the camera via a smartphone app, enhancing the overall user experience.

Additionally, the Canon 2000D supports a range of Canon's EF and EF-S lenses, providing users with the flexibility to explore various photography styles. Its compact and lightweight design makes it highly portable, making it a great companion for travel and everyday photography.

Overall, the Canon 2000D is a versatile and user-friendly DSLR that strikes a balance between image quality, functionality, and ease of use, making it an excellent choice for those embarking on their photographic journey.
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